<template>
  <div class="tags-view-container">
    <el-scrollbar class="tags-view-wrapper">
      <router-link
          class="tags-view-item"
          :class="isActive(tag) ? 'active' : ''"
          :style="{
          backgroundColor: isActive(tag) ? $store.getters.cssVar.menuBg : '',
          borderColor: isActive(tag) ? $store.getters.cssVar.menuBg : ''
        }"
          v-for="(tag, index) in $store.getters.tagsViewList"
          :key="tag.fullPath"
          :to="{ path: tag.fullPath }"

          @contextmenu.prevent="openMenu($event, index)"
      >
        {{ tag.title }}
        <template v-if="!isAffiix(tag)">
          <Close @click.prevent.stop="onCloseClick(index,tag)" class="el-icon-close"/>
        </template>

      </router-link>
    </el-scrollbar>
    <context-menu
        v-show="visible"
        :style="menuStyle"
        :index="selectIndex"
    ></context-menu>
  </div>
</template>

<script setup>
import {Close} from '@element-plus/icons'

import ContextMenu from './ContextMenu.vue'
import {ref, reactive, watch, onMounted} from 'vue'
import {useRoute, useRouter} from 'vue-router'
import {useStore} from 'vuex'
// import store from '@/store'

const route = useRoute()

onMounted(() => {
  console.log(store.getters.cssVar)
})

/**
 * 是否被选中
 */
const isActive = tag => {
  return tag.path === route.path
}
const isAffiix = tag => {
  return tag.meta && tag.meta.affix
}
// contextMenu 相关
const selectIndex = ref(0)
const visible = ref(false)
const menuStyle = reactive({
  left: 0,
  top: 0
})
/**
 * 展示 menu
 */
const openMenu = (e, index) => {
  const {x, y} = e
  menuStyle.left = x + 'px'
  menuStyle.top = y + 'px'
  selectIndex.value = index
  visible.value = true
}

/**
 * 关闭 tag 的点击事件
 */
const store = useStore()
const router = useRouter()

const onCloseClick = (index, tag) => {

  store.commit('app/removeTagsView', {
    type: 'index',
    index: index
  })

  //如果删除的是当前页面，自动定位到上一个页面
  if (isActive(tag)) {
    let tagsViewList = store.getters.tagsViewList
    if (index == 0 && tagsViewList.length >= 1) {
      let pre_index = 0
      let pre_page = tagsViewList[pre_index]
      router.push(pre_page.fullPath)
    } else if (tagsViewList.length == 0) {//如果是最后一个，定位到首页
      router.push('/')
    } else {
      let pre_index = index - 1
      let pre_page = tagsViewList[pre_index]
      router.push(pre_page.fullPath)
    }


  }
}


/**
 * 关闭 menu
 */
const closeMenu = () => {
  visible.value = false
}

/**
 * 监听变化
 */
watch(visible, val => {
  if (val) {
    document.body.addEventListener('click', closeMenu)
  } else {
    document.body.removeEventListener('click', closeMenu)
  }
},
    {
      immediate: true
    })


</script>

<style lang="scss" scoped>
.tags-view-container {
  height: 34px;
  width: 100%;
  background: #fff;
  border-bottom: 1px solid #d8dce5;
  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.12), 0 0 3px 0 rgba(0, 0, 0, 0.04);

  .tags-view-item {
    display: inline-block;
    position: relative;
    cursor: pointer;
    height: 26px;
    line-height: 26px;
    border: 1px solid #d8dce5;
    color: #495060;
    background: #fff;
    padding: 0 8px;
    font-size: 12px;
    margin-left: 5px;
    margin-top: 4px;

    &:first-of-type {
      margin-left: 15px;
    }

    &:last-of-type {
      margin-right: 15px;
    }

    &.active {
      color: #fff;

      &::before {
        content: '';
        background: #fff;
        display: inline-block;
        width: 8px;
        height: 8px;
        border-radius: 50%;
        position: relative;
        margin-right: 4px;
      }
    }

    // close 按钮
    .el-icon-close {
      height: 1em;
      width: 1em;
      line-height: 10px;
      vertical-align: -2px;
      border-radius: 50%;
      text-align: center;
      transition: all 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
      transform-origin: 100% 50%;

      &:before {
        transform: scale(0.6);
        display: inline-block;
        vertical-align: -3px;
      }

      &:hover {
        background-color: #b4bccc;
        color: #fff;
      }
    }

  }
}
</style>
